Pump



y 13, c. E. MEYERHOEFER 2,241,824

PUMP

Filed April 2, 1938 2 Sheets-Sheet 1 a f 2 I t* 2g INVENTOR ATTORNEYS y 1941- c. E.. MEYERHOEFER 2,241,824

PUMP

- Filed April 2, 1938 2 Sheets-Sheet 2 Illlll INVENTOR ATTORNEYS Patented May 13, 1941 2,241,a24 PUMR Carl E. Meyerhoefer, Brooklyn, N. Y., assignor to E. A. Laboratories, Inc., Brooklyn poration of New York Application April 2,1938, Serial No. 199,573

(Cl. 230-140) Y 1 Claim.

This invention relates to a structurally and functionally improved pump.

It is an object of the invention to furnish a unit of this character Which will be capable of producing vacuum and/or pressure conditions within structures coupled to its inlet and discharge ports. Moreover, by means of the present structure a unitis furnished which will operate over long periods of time and under great ranges of speed without detriment to its parts.

A further object is that of providing a pump having the foregoing characteristics and in which wear will be reduced to a minimum aside from the fact that the pump may be operated to cause movement of a fluid while at the same time any danger of such fluid becomi \g contaminated by the pump lubricant will be reduced to a minimum.

Still. another object is that of furnishing a pumpthe parts of which will be relatively few in number and individually simple and rugged in construction, these parts being capable of very economical production. Additionally, if these parts require replacement, this may be readily achieved by the structures herein suggested. Moreover, pumps constructed in accordance with the teachings of the present invention will oper-v ate with minimum noise and friction for indefinite periods of time.

With these and other objects in mind, reference is had to the attached sheets of drawings illustrating practical embodiments of the invention and in which:

Fig. 1 is a sectional front view of one form of pu p;

Figs. 2 and 3 are transverse sectional views taken respectively along the lines 22 and 3-4 and in the direction of the arrows of Fig. 1;

Fig. 4 is a view similar to Fig. 1, but showing an alternative form of construction, and

Fig. 5 is a transverse sectional view taken along the lines 5'5 and in the direction of the arrows of Fig. 4.

Referring primarily to Figs. 1, 2 and 3, it will be noted that the numeral Ill indicates a shaft which extends into a housing preferably including a body II and a. cover l2. This shaft is eccentrically dispmed with respect to the housing, and it will be understood that bolts or other suitable securing means I! may couple the portions voi' the housing to each other and that a gasket may be provided at this point. Moreover, provision for lubrication may be afforded by employing, for example, 011 cups I5 within which wicks ii are disposed. Also as shown, it is pre- N. Y., a corferred that the shaft, instead of extending completely through the housing, terminate in a stub portion ll enclosed within a part. I! conveniently formed integrally with housing i I and mounting, or example, one of the lubricant reservoirs.

Either secured to or integral with shaft III is a rotor I8 formed with a. plurality of radial slots l9 within which blades or vanes 20 are mounted. This rotor, while concentric with res'pect to the shaft lU-Il, is, of course, eccentric with respect to the chamber provided by the housing and cover. This cover may be formed with recesses 2| and 22- commrmicating with ports 23 and 2| respectively. The first of these recesses provides a discharge opening, while the second of the same provides an inlet, this, of course, being conditioned upon the rotor l8 moving in a counter-clockwise direction, as viewed in Figs. 2 and 3.

According -to one aspect of my invention, the pump is to provide for a vacuum condition through its inlet port and for a pressure condition through its outlet. With this thought in mind the inner oradjacent ends of the recesses 2|, 22 may be spaced equidistant from the point of substantial contact between the rotor and housing. However, the opposite or outer end of recess 22 may be spaced from such point to a lesser extent than the outer end of recess 2|. The recesses and ports could, of course, be formed in the main portion l l of the housing, but it ispreferred that as shown they be formed in the cover and in order to prevent leakage it is preferred that a diaphragm 25 be disposed within a housing portion 26 associated with the cover and encircle the shaft l0. Adjacent this diaphragm a shaft seal 21 may be disposed to contact the shoulder of the shaft. Consequently, at points beyond this diaphragm the interior of the mechanism will be substantially isolated from the atmosphere.

In a pump of this type it is apparent that with a relative rotation of the parts as aforedescribed, fluid will be sucked in through opening 24, be impelled by the blades 20, compressed between the same, and expelled through port 23. The centrifugal force will, of course, assure a firm contact between the blades and the inner face of any surface which they engage. Incident to this contact it has heretofore been necessary to provide what, in effect, amounts to a surplusage of lubricant, otherwise, aside from objectionable noise, the edges of the blade and the surfaces engaged thereby will become quickly worn and replacement will be necessary. In many instances the use of lubricant to t extent is not objectionable, but where a vapor or uid is being acted upon and which should not be diluted with lubricant, a real'problem is presented.

With a view to overcoming this difliculty, I interpose between the edges of the vanes" and the inner face of the housing a member 28 which may be cup-shaped and concentrically disposed within the housing. This member may be formed with a radially extending slot 29 within which rides a stud or projection 30 secured to the rotor l3, so that the cup moves in substantial synchronism with the rotor. The housing and covermay present ledge portions 3| upon which the cup rides and at points between these ledge portions the housing may be enlarged to furnish a channel 32 to receive lubricant which-is placed in said channel, for example, when said housing is assembled.

Thus it is apparent that as fluid flows through port 24 towards port 23, the vanes or blades will 7 contact merely the inner face of the cup member 23 and substantially no movement will occur between these parts. Thus, a minimum of lubricant will be necessary, despite the fact that noise.

and wear will be minimized. Of course, full movement will occur between the cup or member 23 and the housing, but lubricant will remain exteriorly of the member 28, this being particularly true incident to centrifugal force. In this manner the difliculties heretofore referred to are overcome.

Now referring to the structure as shown in.

Figs. 4 and 5, it will be seen that a housing 33 is provided which is furnished with a cover 34 conveniently mounting an extension 35 receiving a diaphragm 35 and shaft seal 31; If desired, antifriction bearings may be disposed within exten- The housing 33 isin the form under consideration-formed with an intake port and groove.

42 and a discharge groove and port 43. The rotor body 44 secured to shaft 38 presents a series of radially extending pockets mounting rollers 45. It is thus apparent that if the shaft is rotated in a counter-clockwise direction as indicated in fluid will be sucked through the port and recess 42 and discharged through the recess and port 43. Noise and friction will be reduced to a material extent incident to the employment of the rollers 45 and thelatter will be maintained in proper cooperating contact ,with the inner face of the housing incident to the action of centrifugal force.

However, even in a structure such asthis, a certain amount of lubrication will be desired and with this thought in mind the cover 34 may be formed with an arcuate groove 46 extending conveniently from a point in line with the port and races 42 to a point intermediate the ports 42 and 43. Assuming the arcuate. groove 46 to be coupled to a source of lubricant by means'of a pipe 41, it is obvious that incident to the fact that this groove is in line with the base portions of the pockets or slots receiving the rollers 45, it will be subjected to suction or vacuum as the parts move in the direction of the arrows as aforedescribed. Consequently, oil will be sucked into the roller-receiving slots, or pockets, as the members within the same move outwardly and these pockets will be filled with lubricant or vapor surcharged with lubricant at the beginning of the compression stroke or zone of the pump.

' Due to the fact that the rollers are forced inwardly throughout that zone, the lubricant and vapor within which the same is entrained will be forced to flow past the ends of the rollers and between the edge of the rotor 44 and the cover and housing. In this manner all the parts will be efliciently lubricated. The lubricant will escape with the fluid discharged through the recess and port 43 and this liquid will conveniently flow through a trap member 48 which will serve to separate the lubricant from the liquid within which it is entrained. Coupled to the trap member is the tube or pipe 41 and it is accordingly obvious that the aforedescribed cycle of operation will be repeated indefinitely.

As S gested in Fig. 4, a spring 49 may be interposed between the diaphragm and the extension 35, this being especially desirable if within the housing conditions above atmospheric are to prevail.

From the foregoing it will be appreciated that, among others, the several objects of the invention are achieved. Obviously, numerous changes in construction and rearrangement of the parts might be resorted to without departing from the spirit of the invention as defined by the claim.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

A pump including a casing defining in cross section an annular rotor receiving space, fluid inlet and outlet openings communicating therewith at one end thereof, a shaft extending through said casing and eccentrically disposed with reference to said space, a rotor carried by said shaft, vanes supported by and extending beyond said rotor, a cup-shaped member having a diameter substantially equal to that of said space and disposed therein, the width of said member bein substantially equal to the width of said space, the base of said member being interposed between said rotor and casing at the end thereof opposite the end having said fluid intake and outlet openings and presenting a central opening of an area such that said shaft may extend therethrough, said opening having sealing contact with the end face of said rotor, means for positively coupling said cup-shaped member to rotate with said rotor and ledge portions forming a part of said casing adjacent the ends of the same, such portions defining between them a channel, said cup-shaped member being spaced from the base of the said channel and being supported solely upon the faces of id ledge portions and said channel presenting a reservoir for lubricant tolubricate said cup-shape member as it revolves on said ledge portions.

' C ARL E. MEYERHOEF'ER. 

